<template>
    <div class="wrapper">
        <v-head></v-head>
        <v-sidebar></v-sidebar>
        <div :class="{'content-collapse':collapse}" class="content-box">
            <v-tags></v-tags>
            <div class="content">
                <transition mode="out-in" name="move">
                    <keep-alive :include="tagsList">
                        <router-view></router-view>
                    </keep-alive>
                </transition>
            </div>
        </div>
    </div>
</template>

<script>
    import vHead from './Header.vue';
    import vSidebar from './Sidebar.vue';
    import vTags from './Tags.vue';
    import bus from './bus';

    export default {
        data() {
            return {
                tagsList: [],
                collapse: false
            };
        },
        components: {
            vHead, vSidebar, vTags
        },
        // components:{
        //     vHead, vSidebar
        // },
        created() {
            bus.$on('collapse', msg => {
                this.collapse = msg;
            });

            // 只有在标签页列表里的页面才使用keep-alive，即关闭标签之后就不保存到内存中了。
            bus.$on('tags', msg => {
                let arr = [];
                for (let i = 0, len = msg.length; i < len; i++) {
                    msg[i].name && arr.push(msg[i].name);
                }
                this.tagsList = arr;
            });
        }
    };
</script>
